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[Pneumocystis carinii pneumonia (pneumocystosis)]
1Abteilung Diagnostische Radiologie I, Medizinischen Hochschule Hannover.
Insights
Pneumocystis pneumonia (PCP) now commonly affects immunocompromised individuals, especially those with AIDS. Radiographic findings like butterfly-pattern shadowing are typical, but large effusions or adenopathy suggest other diagnoses.
Area of Science:
- Medicine
- Infectious Diseases
- Pulmonology
Background:
- Pneumocystis carinii (now jirovecii) pneumonia (PCP) historically impacted premature infants.
- PCP is now a significant opportunistic infection in immunocompromised patients, notably those with AIDS.
Purpose of the Study:
- To describe the epidemiological shift and characteristic radiographic findings of PCP.
- To differentiate PCP from other conditions based on imaging features.
Main Methods:
- Review of clinical presentations and radiographic findings in patients with PCP.
- Comparison of imaging features suggestive of PCP versus alternative diagnoses.
Main Results:
- PCP has transitioned from an infant-specific illness to a major complication in immunocompromised adults, particularly AIDS patients.
- Characteristic chest X-ray findings include diffuse, bilateral, perihilar alveolar and interstitial shadowing (butterfly pattern).
- Absence of large pleural effusions and hilar adenopathy supports a diagnosis of PCP.
Conclusions:
- PCP presentation has evolved, predominantly affecting immunocompromised populations.
- Radiographic patterns are key for diagnosis, with specific features helping to exclude other conditions.
Abstract:
In former times Pneumocystis carinii (PC) primarily affected premature infants. More recently, it has proved to be one of the major infectious complications among immunocompromised patients, particularly those with AIDS. The most frequent radiographic feature is diffuse, bilateral alveolar and interstitial perihilar shadowing, spreading in a butterfly pattern. The typical findings may mimic other infectious diseases, but the presence of large pleural effusions of hilar adenopathy is evidence against the diagnosis of PC-pneumonia.